[RFC PATCH v1.2 02/11] mm/damon/sysfs: kobject_del() region and target (error) dirs

[SeongJae Park]

On CONFIG_DEBUG_KOBJECT_RELEASE enabled kernel, lack of kobject_del()
could cause directories creation failures due to the name conflicts. Fix
those issues for the normal creation path of region directories and the
error path of target directories, by adding kobject_del() calls.

Fixes: 2031b14ea757 ("mm/damon/sysfs: support the physical address space monitoring")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.18.x
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
 mm/damon/sysfs.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index dba1c67fc188f..3c349f0fe80f0 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -107,8 +107,10 @@ static void damon_sysfs_regions_rm_dirs(struct damon_sysfs_regions *regions)
 	struct damon_sysfs_region **regions_arr = regions->regions_arr;
 	int i;
 
-	for (i = 0; i < regions->nr; i++)
+	for (i = 0; i < regions->nr; i++) {
+		kobject_del(&regions_arr[i]->kobj);
 		kobject_put(&regions_arr[i]->kobj);
+	}
 	regions->nr = 0;
 	kfree(regions_arr);
 	regions->regions_arr = NULL;
@@ -372,13 +374,15 @@ static int damon_sysfs_targets_add_dirs(struct damon_sysfs_targets *targets,
 
 		err = damon_sysfs_target_add_dirs(target);
 		if (err)
-			goto out;
+			goto del_out;
 
 		targets_arr[i] = target;
 		targets->nr++;
 	}
 	return 0;
 
+del_out:
+	kobject_del(&target->kobj);
 out:
 	damon_sysfs_targets_rm_dirs(targets);
 	kobject_put(&target->kobj);
-- 
2.47.3